﻿using System;
using System.Collections.Generic;
using System.Net;
using System.IO;
using System.Text;
using System.Threading.Tasks;

namespace fqlmoney.Common
{
    public class HttpServiceHelper
    {
        /// <summary>
        /// 处理http POST请求
        /// </summary>
        /// <param name="xml">数据内容</param>
        /// <param name="url">地址</param>
        /// <returns></returns>
        public static async Task<string> Post(string xml, string url)
        {

            System.GC.Collect();//垃圾回收，回收没有正常关闭的http连接

            string result = "";//返回结果

            HttpWebRequest request = null;
            HttpWebResponse response = null;
            Stream reqStream = null;

            try
            {
                //设置最大连接数
                //request.DefaultConnectionLimit = 200;
                //设置https验证方式
                //if (url.StartsWith("https", StringComparison.OrdinalIgnoreCase))
                //{
                //    ServicePointManager.ServerCertificateValidationCallback =
                //            new RemoteCertificateValidationCallback(CheckValidationResult);
                //}

                /***************************************************************
                * 下面设置HttpWebRequest的相关属性
                * ************************************************************/
                request = (HttpWebRequest)WebRequest.Create(url);

                request.Method = "POST";
                //request.Timeout = timeout * 1000;

                //设置代理服务器
                //WebProxy proxy = new WebProxy();                          //定义一个网关对象
                //proxy.Address = new Uri(WxPayConfig.PROXY_URL);              //网关服务器端口:端口
                //request.Proxy = proxy;
                request.Proxy = null;

                //设置POST的数据类型和长度
                request.ContentType = "text/xml";
                byte[] data = System.Text.Encoding.UTF8.GetBytes(xml);
                //request.ContentLength = data.Length;



                //往服务器写入数据
                reqStream = await request.GetRequestStreamAsync();
                reqStream.Write(data, 0, data.Length);
                reqStream.Dispose();

                //获取服务端返回
                WebResponse wr = await request.GetResponseAsync();

                //获取服务端返回数据
                StreamReader sr = new StreamReader(wr.GetResponseStream(), Encoding.UTF8);
                result = sr.ReadToEnd().Trim();
                sr.Dispose();
            }
            catch (WebException e)
            {
                LogHelper.Error("HttpServiceHelper错误", e.ToString());
            }
            catch (Exception e)
            {
                LogHelper.Error("HttpServiceHelper错误", e.ToString());
            }
            finally
            {
                //关闭连接和流
                if (response != null)
                {
                    response.Dispose();
                }
                if (request != null)
                {
                    request.Abort();
                }
            }
            return result;
        }

        /// <summary>
        /// 处理http GET请求，返回数据
        /// </summary>
        /// <param name="url">请求的url地址</param>
        /// <returns>http GET成功后返回的数据，失败抛WebException异常</returns>
        public static async Task<string> Get(string url)
        {
            System.GC.Collect();
            string result = "";

            HttpWebRequest request = null;
            HttpWebResponse response = null;

            //请求url以获取数据
            try
            {

                /***************************************************************
                * 下面设置HttpWebRequest的相关属性
                * ************************************************************/
                request = (HttpWebRequest)WebRequest.Create(url);

                request.Method = "GET";

                //获取服务器返回
                WebResponse wr = await request.GetResponseAsync();

                //获取HTTP返回数据
                StreamReader sr = new StreamReader(wr.GetResponseStream(), Encoding.UTF8);
                result = sr.ReadToEnd().Trim();
                sr.Dispose();
            }
            
            catch (WebException e)
            {
                LogHelper.Error("HttpServiceHelper错误", e.ToString());
            }
            catch (Exception e)
            {
                LogHelper.Error("HttpServiceHelper错误", e.ToString());
            }
            finally
            {
                //关闭连接和流
                if (response != null)
                {
                    response.Dispose();
                }
                if (request != null)
                {
                    request.Abort();
                }
            }
            return result;
        }

    }
}
